You did the right thing, as hard as it was.
If you are worried, I would call on the person again, or if you can remember the phone number or address, give them a call or drop them aline and say....
If your dog ever becomes too much for you or you want a home for it, I would take it.....
Even if you did not keep it you could always find it a loving home.
She just might give the little thing up.
To me Tink is not just a dog, she is my little girl and now I have her I would do anything for her.
I think everyone should feel this way before taking on a dog....so many are taking these little dogs on as a fashion accessory and not for the love of them...ggggrrrrr........ok sorry...rant over!